To address the LF, I built a 30.5"-wide THT (Tuba HT
) subwoofer. I hooked it up to Behringer iNUKE NU1000DSP
, which I put into Bridge mode, for roughly 750W RMS.
Subjectively, it's fricking awesome, but how does it measure? - that's what this thread's about
First, here's the farfield:
With equalization, I was able to get a pretty flat response between 20-80 Hz. My amp's cross-over is set for 80Hz, the the rest of the graph isn't too relevant. You can't see it very well, but it's +-2.5 dB, which is within the +-3dB range specified by Paul Spencer's Bass Integration Guide
Notice the huge null at 90Hz. This wasn't there with my old sub:
And it's not in the sub's nearfield measurement:
My guess is that this null might disappear if I move the sub around a little.
Here are some more plots illustrating decay:
The lack of decay in the 20-40Hz range isn't too bad, considering that the dB drops 15 points within 150ms, but -20dB is the recommended target, so maybe I'm kidding myself about it...
More concerning is the lack of decay over 80Hz, but then again, my sub is crossed-over at 80Hz, so this somewhat disappears. I say "somewhat" as the main/surround speaker graphs I posted earlier (post #79
) identified similar decay issues - specifically around 90Hz, 110Hz, 130Hz, 160Hz, 170Hz, and 270Hz.
So, it appears that my bass below 80Hz is in pretty good shape (anyone disagree?). That being the case, the next step is to try to address the decay issues between 80-300Hz - any ideas? - more bass traps I guess...